Gear-changing drive



Oct. 18, 1949. J, E. GORR LL 2,485,151

I GEAR-CHANGING DRIVE Filed Nov. 24, 1945 l 4 Shets-Sheet 1 Y B I MMcMATTORNEYS Oct. 18, 1949. J. E. GORRELL 2,485,151

-" GEAR-CHANGING DRIVE Filed Nov. 24, 1945 4 Sheets-Sheet 2 M/VEA/MRJOHN ELL/SON GOP/PELL Oct. 18, 1949. J. E. GORRELL GEAR-CHANGING DRIVEFiled Nov. 24, 1945 4 Sheets-Sheet 4 I 28 DAYS DAYS JOHN ELL/JON GORPELLg (s44 nae/,4

Patented Oct. 18, 1949 UNITED STATES PATENT OFFICE GEAR-CHANGING DRIVEJohn Ellison Gorrell, Haworth, N. J.

Application November 24, 1945, Serial No. 630,594

12 Claims. 1

This invention relates to improvements in gear-changing drives.

One object of this invention is to provide an improved gear-changingdrive or device which provides a wide range of speeds of the outputshaftof the device.

Another object of this invention is to provide an improved gear-changingdrive having an indicator which automatically indicates the changes inspeed corresponding to the output-shaft.

Another object of this invention is to provide an improved gear-changingdrive formed of simple elements to produce an efficient, durableconstruction.

With the above and other objects in view, as will appear to thoseskilled in the art from the present disclosure, this invention includesall features in the said disclosure which are novel over the prior art.

In the description and claims, the various parts and steps areidentified by specific terms for convenience, but they are intended tobe as generic in their application as the prior art will permit.

In the accompanying drawings forming part of the present disclosure, inwhich one way of carrying out the invention is shown for illustrativepurposes:

Fig. 1 is a top plan view on a reduced scale, illustrating oneembodiment of a gear-changing device made in accordance with the presentinvention;

Fig. 2 is a, front elevation of Fig. 1;

Fig. 3 is a full scale plan view similar to Fig. 1, but with thecover-plate removed;

Fig. 4 is a sectional view on line 4-4 of Fig. 3';

Fig. 5 is a sectional view on line 5-5 of Fig. 4;

Fig. 6 is a sectional view on line G--6 of Fig. 3;

Fig. 7 is a perspective View of the swingable frame;

Fig. 8 is a perspective view of one of the cams of the rotatableshifter-shaft; and

Fig. 9 is a developed plan view of the indicator surface of theindicator-wheel.

Referring to the drawings showing the particular form of the inventionchosen for illustration therein, the gear-changing drive or device II]includes a base in the form of a hollow box II, in the opposite sides I2and I3 of which, are secured bushings I4 in which an input ordriving-shaft I5 is rotatably mounted.

A swingable frame I6 is formed of two sidebars I! and I8 which areinterconnected at their upper end-portions by a rod or bar I9 which isclamped to the side-bars I1 and I8 by the nuts which are threaded on thethreaded ends ll 55 of the bar I9. The side-bars II and I8 areinterconnected at their intermediate portion by an intermediate shaft 22which is secured to the sidebars I1 and I8 by screws 23. The lower endsof the side-bars H and I8 of the frame I6 are pivoted at 24 on the-shaftI5 to Swing about the axis of the shaft I5.

A gear 25 has its hub 26 fixedly secured to the shaft I5 adjacent oneend, in any suitable way, as for example by a pin 21, and a collar 28 isfixedly secured to the shaft I5 adjacent its other end, by the pin 29.Freely rotatable on the shaft I5 between the gear 25 and the collar 28,are a plurality of pairs of gears or gear pairs to M inclusive. The gearpair 30 consists of the two gears 30a and 30b, the gear 30a being fixednonrotatably relatively to the gear 3% in any suitable way, as forexample, by being fixedly secured upon the hub-extension 300 of the gear302). In similar manner, each of the other gear pairs 3| to M have theirrespective gears 3Ia to 4m respectively non-rotatably connected to thegears ill!) to MD inclusive. Thus each gear pair 30 to 4| inclusive isfree to rotate on the shaft I5 as a unit, independently of each of theother gear pairs on the shaft I5.

Two spaced-apart collars 42 and 43 are fixedly secured to theintermediate shaft 22 by any suitable means, as for example by the pins44. Freely rotatable on the shaft 22 are a plurality of gear pairs 45 to56 inclusive, and a single gear 51. The gear pair 45 includes a gear 45asecured non-rotatably to the gear 451) by being fixedly secured on thehub 450 of the gear 451). And the gears of each of the other gear pairs45 to 56 are similarly connected together. Each of the gear pairs 45 to56 is freely rotatable on the shaft 22 independently of each other gearpair, and of the single gear 51.

The gear 25 which is secured to the shaft I5, is in driving-relationwith the gear 45a on the shaft 22, and the other gear 45b of the gearpair 45 which is non-rotatable relatively to the gear 45a, is indriving-relation with the gear 30a of the gear pair 30 on the shaft I5,and the gear 3% of the gear pair 30 on the shaft I5 is indriving-relation with the gear 46a of the gear pair 46 on the shaft 22,and the drive between the pairs of gears on the shafts I5 and 22alternates back and forth in the manner just described until finally thegear 4Ia of the last gear pair 4| on the shaft I5 is driven from thegear 5% of the gear pair 56 on the shaft 22, and finally the gear 4Ib ofthe gear pair 41 on the shaft [5 drives the single gear 51 on the shaft22.

Thus the gear 25 and the gear 45a are in meshing or drive-relation withone another, and thus form a pair of meshing or drive-gears. Andsimilarly, each other two meshing gears such for example as the gear551) on the shaft 22 and the gear 30a on the shaft l5, are in mesh witheach other and thus form a meshing or drive-pair of gears. As each ofthe :1 gears 45a to 56a inclusive and the single gear 57 are free torotate independently of one another on the shaft 22, it will be obviousthat by suitably selecting any desired different ratio between thepitch-diameters of any meshing or drive-pair of gears, that any desiredrange of speeds of rotation, within limits, can be given to the a gears45a to Sta inclusive and the single gear By having the gear and each ofthe b gears b to Mb inclusive, of the same pitch-diameter,it ispossible,and preferable, to have all of the a gears 45a to 56a inclusiveand the single gear M of a single pitch-diameter, for reasons which willbe laterexplained.

An output or driven-shaft 58 is rotatably mounted in bushings 59 in theside walls 12 and [3 of the box H, and has a shifter-gear 60 (Fig.

6) splined thereon by the spline 6| so as to be non-rotatable relativelyto the shaft 58 but 1ongitudinally slidable thereon. A shifter-arm 62 islongitudinally slidable on the shaft 58, and permits free rotation ofthe latter shaft 58. The shifter-arm 62 is threadedly engaged with ashifter-screw shaft 63 which is rotatably mounted in the side walls l2and I3 and carries at its end, an operating hand-grip or knob 64. Theshaft 63 is held against longitudinal movement by means of twocam-collars 0r earns 65 secured to the opposite end portions of theshaft 63 by any suitable means as for example by the screws 66. Each ofthe cams 65 has its major outer surface portion fill of cylindrical formand concentric with its axis and with the axis of the shiftershaft 63. Acam-depression 68 provides two oppositely sloping cam surfaces 69, allfor purposes which will hereinafter be described.

A pinion 78 has a screw-threaded shank H which is screwed into one endof the shiftershaft 63. The pinion it is in mesh and drivingengagementwith a gear '12 (Fig. 3) which is secured to an indicator orindicator-member 73 of cupshape form, by any suitable means as forexample by the screws 74. A bearing-screw 15 extends through the members13 and 12 and a spacer-collar l6, and has its inner threaded end 'l'lthreadedly engaged in the side wall 12.

The outer cylindrical face or surface 18 of the indicator-member 13 canbe marked with indicator marks 79 and proper indicator labels ordesignations as for example those illustrated in Fig. 9, which is adeveloped view of the surface 18 of the indicator-member 13. Theindicator marks 79 are labeled as shown, from one second up to andincluding 28 days, which labeling will hereinafter be referred to inmore detail.

As the frame It is pivoted coaxially with the shaft IE, to swing aboutthe shaft 15 from its position illustrated in full lines of Fig. 4 to orbeyond its broken-line outline position shown in Fig. 4, the gears onthe shaft 22 will always remain in mesh with the meshing gears on theshaft l5, regardless of the rotational or pivoted position of the frameIt. If the shifter-gear shaft 63 is rotated to bring the shifter-gear 60into planar-alignment with any one of the a gears 65a to 560. or thesingle gear 51, then if the frame it is swung from its broken-line'outline position to its full-line position shown in Fig. 4, then suchtwo gears as have been planarly aligned, will be brought into mesh withone another as indicated in full solid lines in Fig. 4. The frame I6 isnormally urged or swung toward the left of Fig. 4 by means of a spring80 secured to the rod or shaft l9 and also secured to a portion 8! ofthe box II (Figs. 3 and 5). When the lugs 82 formed on the side-bars I"!and [8 of the frame I6, are located in the camdepressions 68, preferablywith the upper ends 83 of the side-bars l6 and I1 engaging against limitmeans such as the screws 84 which are secured in lug-portions 85 of thebox ll, then the shifter-gear 59 and the other such gear on the shaft 22as it is in planar-alignment with, if any, will be brought into meshwith one another as illustrated in solid lines in Fig. 4.

When the hand-knob 64 is rotated either clockwise or anti-clockwise, theshifter-arm G2 is moved in a corresponding longitudinal direction in onedirection or the other along the shaft 58, and correspondingly slidesthe shifter-gear 60 along with it. The construction and arrangement andproportions of all of the parts are such that when the shifter-arm 62has moved the shifter-gear 60 into substantially planar-alignment withany one of the a gears 45a to 5611 inclusive and single gear 51 on theshaft 22, then the cam-depressions 68 will have concurrently arrived atthe position illustrated in solid lines in Fig. 4 to thus permit thespring 80 to swing the frame 16 and the bank of gears on the shaft 22carried by the frame It, to bring the gear on shaft 22 with which theshifter-gear 60 has been aligned, into mesh or drive-relation. And whenthe hand-knob 64 is rotated in either direction. from the positionillustrated in solid lines in Fig. 4, sumciently to cause one or theother of the oppositely-sloped cam-surfaces 69 to force the lugs 82 ofthe frame l6 outwardly against the action of the spring 80, to thus movethe two gears which were planarly-aligned, apart or out of mesh.Continued rotation of the shaft 63 by means of the knob 64 in eitherdirection, will again bring the cam-depression 68 beneath the lugs 82when the shifter-gear 6D has again been planarly-aligned in position formeshing, with one of the a gears 45a to 56a inclusive or single gear 51.And each time that the cams 65 are moved to the position shown in solidlines in Fig. 4 to thus permit the meshing action of twoplanarly-aligned gears, one of the indicatormarkings 19 will be broughtinto indicating position opposite the indicator or arrow-point 86 (Fig.1), through the action of the gears '10 and 12 (Fig. 3). It will thus beseen that the operation of the parts 68 and 82 is most effectivelyaccomplished for the gears on the intermediate shaft 22 that aremeshable with the shifter-gear 6|], by having said meshableintermediate-shaft gears all of the same pitch diameter, thus at alltimes accomplishing proper meshing and proper cooperation of parts 68and 82 since the swingable frame 16 will always be swung to the sameangular position about the shaft IE to cause meshing with theshifter-gear 60'.

In the particular embodiment illustrated in the drawings, the shaft I5is sometimes referred to herein as the input or driving-shaft, and theshaft 58 is sometimes referred to herein as the output or driven-shaft,but whether the shaft [5 is the driving or driven shaft in a givendevice, and whether the shaft 58 is correspondingly the driven ordriving shaft, each of such shafts is a drive-shaft, and maybe soreferred to. And

when two shafts, gears, etc., are referred to as being indrive-relation, this expression is intended to not distinguish as towhich is the driving and which is the driven member. With any given agear 45a to 56a or single gear 51, in mesh with the shifter-gear 60,these two shafts l5 and 58 will have a certain speed-ratio between themregardless of which is the driving-shaft and which is the drivenshaft.In the particular embodiment illustrated in the drawings, the indicatormarkings of from one second to twentyeight days illustrated in Fig. 9,correspond to a rotational speed of the driving-shaft I5, of sixtyrevolutions per minute. When the shifter-gear 60 has beenplanarly-aligned for meshing position with the gear 4511, the one-secondindicator mark will be indicated by the arrow-point 86. Andcorrespondingly, when the shifter-gear 60 has been successively shiftedfurther to the right of Fig. 6, as it successively comes inplanar-alignment with one and then the other of the successive a gears45a to 55a inclusive and the single gear 51, corresponding indicatormarkings of five seconds, fifteen seconds, one minute, etc., willcorrespondingly appear opposite the arrow-indicator B6.

Inasmuch as the shifter-gear 60 is illustrated in the drawings asaligned with the gear 48a on the shaft 22, the indicator-arrow 86 willindicate the one-minute speed of rotation for the output shaft 58. Whenthe shifter-gear 60 is in driverelation with the gear 45a on the shaft22, then if the input shaft l5 rotates once per second or sixty perminute, then the output-shaft 58 will also rotate once per second orsixty per minute, and this is indicated by the one-second indicationnear the lower end of Fig. 9. And with the same rotational speed ofsixty per minute of the inputshaft l5, if the shifter-gear 59 is indrive-relation with the next gear 461:. on the shaft 22, then, with theproportions of the parts illustrated in the drawings, the output-shaft58 will rotate once in five seconds or one-fifth as fast as theinput-shaft l 5, and so on. While the input-shaft [5 can be driven inany suitable way at any suitable speed and by any suitable means, oneway in which this can be satisfactorily accomplished is to drive it withan electric-motor having a speed of rotation of, for example, eighteenhundred R. P. M., and reduced by reduction-gearing to a motoroutput-shaft which rotates at sixty revolutions per minute and which isdirectly connected to the input-shaft l5 and thereby causes the shaft IEto rotate at sixty revolutions per minute. Of course, any other speed ofrotation desired, could be given to the shaft 15, the speed of rotationof sixty per minute being merely used as illustrative, and to correspondwith the indicator-markings and proportions of the parts as illustratedin the drawings.

When two members such for example as two shafts, are referred to as afirst shaft and a second shaft, the sole purpose of use of the termsfirst and second is to distinguish one shaft from the other.

Gear-changing drives or units made in accordance with the presentinvention have a very wide range of speed-drives for the output-shaft58, as will be evident from Fig. 9, and it gives these rates of onerevolution in each of the times indicated in Fig. 9 depending upon themesh-position of the shifter-gear 60, with great precision. And,therefore, one use for the present device can be for driving a chart atany one of a predetermined number of a wide range of speeds.

The invention may be carried out in other specific ways than thoseherein set forth without departing from the spirit and essentialcharacteristics of the invention, and the present embodiments are,therefore, to be considered in all respects as illustrative and notrestrictive, and all changes coming within the meaning and equivalencyrange of the appended claims are intended to be embraced therein.

I claim:

1. A gear-changing drive including: a rotatable driving shaft; arotatable driven shaft; an intermediate shaft; a driving gear driven bysaid driving shaft; a first set of independently rotatable pairs ofgears on said intermediate shaft, the gears of each pair of a number ofsaid pairs of gears being fixed non-rotatably relatively to one another;a second set of independently rotatable pairs of gears, the gears ofeach pair being fixed non-rotatably relatively to one another; saiddriving gear being in driving relation with one gear of a pair of saidfirst set of pairs of gears; one gear of each pair of a number of pairsof said first set of pairs of gears respectively being in drivingrelation with a gear of each pair of a number ofpairs of said second setof pairs of gears, and the other gear of each pair of a number of pairsof said first set of pairs of gears respectively being in drivenrelation with a gear of each pair of a number of pairs of said secondset of pairs of gears; a shifter-gear having driving relation with saiddriven shaft, and adapted to be selectively engaged with one gear ofeach pair of a number of pairs of said first set of pairs of gears; saidgears being so constructed and arranged that said selective engagementof said shifter-gear with said gears of said first set of pairs ofgears, selectively provides different selectable speed-ratios betweensaid driving and driven shafts.

2. A gear-changing drive including: a rotatable driving shaft; arotatable driven shaft; an intermediate shaft; a driving gear driven bysaid driving shaft; a first set of independently rotatable pairs ofgears on said intermediate shaft, the gears of each pair of a number ofsaid pairs of gears being fixed non-rotatably relatively to one another;a second set of independently rotatable pairs of gears, the gears ofeach pair being fixed non-rotatably relatively to one another; saiddriving gear being in driving relation with one gear of a pair of saidfirst set of pairs of gears; one gear of each pair of a number of pairsof said first set of pairs of gears respectively being in drivingrelation with a gear of each pair of a number of pairs of said secondset of pairs of gears, and the other gear of each pair of a number ofpairs of said first set of pairs of gears respectively being in drivenrelation with a gear of each pair of a number of pairs of said secondset of pairs of gears; a shifter-gear on and longitudinaily slidable butnon-rotatable relatively to said driven shaft, and adapted to beselectively engaged with one gear of each pair of a number of pairs ofsaid first set of pairs of gears; said gears being so constructed andarranged that said selective engagement of said shifter-gear with saidgears of said first set of pairs of gears, selectively providesdifferent selectable speed-ratios between said driving and drivenshafts.

3. A gear-changing drive including: a rotatable driving shaft; arotatable driven shaft; an intermediate shaft; a driving gear driven bysaid driving shaft; a first set of independently rotatable pairs ofgears on said intermediate shaft, the gears of each pair of a number ofsaid pairs of gearsfbeing fixed non-rotatably relatively to one another;a second set of independently rotatable pairs of gears, the gears ofeach pair being fixed non-rotatably relatively to one another; saiddriving gear being in driving relation with one gear of a pair of saidfirst set of pairs of gears; one gear of each pair of a number of pairsof said first set of pairs of gears respectively being in drivingrelation with a gear of each pair of a number of pairs of said secondset of pairs of gears, and the other gear of each pair of a number ofpairs of said first set of pairs of gears respectively being in drivenrelation with a gear of each pair of a number of pairs of said secondset of pairs of gears; a shifter-gear on and longitudinally slidable butnon-rotatable relatively to said driven shaft; shifter-means adapted toselectively shift said shifter-gear into planar alignment with one gearof each pair of a number of pairs of said first set of pairs of gears,and meshing-means actuated by said shifter-means to cause meshing ofsaid shifter-gear and a gear with which it has been selectively shiftedinto planar alignment;

said gears being so constructed and arranged that said selectiveengagement of said shifter-gear with said gears of said first set ofpairs of gears, selectively provides different selectable speedratiosbetween said driving and driven shafts.

4. A gear-changing drive including: a rotatable driving shaft; arotatable driven shaft; an intermediate shaft; a driving gear driven bysaid driving shaft; a first set of independently rotatable pairs ofgears on said intermediate shaft, the gears of each pair of a number ofsaid pairs of gears being fixed non-rotatably relatively to one another;a second set of independently rotatable pairs of gears, the gears ofeach pair being fixed 'non-rotatably relatively to one another; saiddriving gear being in driving relation with one gear of a pair of saidfirst set of pairs of gears; one gear of each pair of a number of pairsof said first set of pairs of gears respectively being in drivingrelation with a gear of each pair of a number of pairs of said secondset of pairs of gears, and the other gear of each pair of a number ofpairs of said first set of pairs of gears respectively being in drivenrelation with a gear of each pair of a number of pairs of said secondset of pairs of gears; a shifter-gear on and longitudinally slidable butnon-rotatable relatively to said driven shaft; a rotatably-mountedshiftershaft; shifter-means engaged with said shiftershaft and adaptedto be moved longitudinally of said shifter-shaft by rotation of saidshiftershaft to selectively shift said shifter-gear into planaralignment with one gear of each pair of a number of pairs of said firstset of pairs of gears, and meshing-means actuated by rotation of saidshifter-shaft to cause meshing of said shiftergear and a gear with whichit has been selectively shifted into planar alignment; said gears beingso constructed and arranged that said selective engagement of saidshifter-gear with said gears of said first set of pairs of gears,selectively provides different selectable speed-ratios between saiddriving and driven shafts.

5. A gear-changing drive including: a rotatable driving shaft; arotatable driven shaft; an intermediate shaft; a driving gear driven bysaid driving shaft; a first set of independently rotatable pairs ofgears on said intermediate shaft, the gears of each pair of a number ofsaid pairs of gears being fixed non-rotatably relatively to one another;a second set of independently rotatable pairs of gears, the gears ofeach pair being fixed non-rotatably relatively to one another; saiddriving gear being in driving relation with one gear of a pair of saidfirst set of pairs of gears; one gear of each pair of a number of pairsof said first set of pairs of gears respectively being in drivingrelation with a gear of each pair of a number of pairs of said secondset of pairs of gears, and the other gear of each pair of a number ofpairs of said first set of pairs of gears respectively being in drivenrelation with a gear of each pair of a number of pairs of said secondset of pairs of gears; a shifter-gear on and longitudinally slidable butnon-rotatable relatively to said driven shaft; a rotatably-mountedshifter-shaft; shifter-means engaged with said shifter-shaft and adaptedto be moved longitudinally of said shifter-shaft by rotation of saidshifter-shaft to selectively shift said shifter-gear into planaralignment, with one gear of each pair of a number of pairs of said firstset of pairs of gears, and meshing-means actuated by rotation of saidshifter-shaft to cause meshing of said shifter-gear and a gear withwhich it has been selectively shifted into planar alignment; said gearsbeing so constructed and arranged that said selective engagement of saidshifter-gear with said gears of said first set of pairs of gears,selectively provides different selectable speed-ratios between saiddriving and driven shafts; and speed-indicator means actuable byrotation of said shiftershaft to indicate the speed corresponding to anyselectively meshed gears.

6, A gear-changing drive including: a rotatable driving shaft; arotatable driven shaft; a frame pivoted to swing about an axis co-axialwith the axis of said driving shaft; and intermediate shaft mounted insaid frame parallel to said driving shaft; a driving gear driven by saiddriving shaft; a first set of independently rotatable pairs of gears onsaid intermediate shaft, the gears of each pair of a number of saidpairs of gears being fixed non-rotatably relatively to one another; asecond set of independently rotatable pairs of gears, the gears of eachpair being fixed non-rotatably relatively to one another; said drivinggear being in driving relation with one gear of a pair of said first setof pairs of gears; one gear of each pair of a number of pairs of saidfirst set of pairs of gears respectively being in driving relation witha gear of each pair of a number of pairs of said second set of pairs ofgears, and the other gear of each pair of a number of pairs of saidfirst set of pairs of gears respectively being in driven relation with agear of each pair of a number of pairs of said second set of pairs ofgears; a shifter-gear on and longitudinally slidable but non-rotatablerelatively to said driven shaft; shifter-means adapted to selectivelyshift said shifter-gear into planar alignment with one gear of each pairof a number of pairs of said first set of pairs of gears, and said frameadapted to be swung to cause a gear on said intermediate shaft which isin planar alignment with said shifter-gear, to mesh with saidshifter-gear; said gears being so constructed and arranged that saidselective engagement of said shifter-gear with said gears of said firstset of pairs of gears, selectively provides different selectablespeed-ratios between said driving and driven shafts.

7. A gear-changing drive including: a rotatable driving shaft; arotatable driven shaft; a frame pivoted to swing about an axis co-axialwith the axis of said driving shaft; an intermediate shaft mounted insaid frame parallel to said driving shaft; a drivin sear driven by saiddriving shaft; 21. first set of independently rotatable pairs ofgears-on said intermediate shaft. the gears of each pair of a number Ofsaid pairs of gears being fixed non-rotatably relatively to one another;a second set of independently rotatable pairs of gears, the ears of eachpair being fixed non-rotatably relatively to one another; said drivinggear being in driving relation with one gear of a pair of said first setof pairs of gears;

one gear of each pair of a number of pairs of said '10 with saidshifter-gear; said gears being so constructed and arranged that saidselective engagement of said shifter-gear with said gears of said firstset of pairs of gears, selectively provides different selectablespeed-ratios between said driving and driven shafts.

9. A gear-changing drive including: a rotatable driving shaft; arotatable driven shaft; a frame pivoted to swing about an axis coaxialwith the axis of said driving shaft; an intermediate shaft mounted insaid frame parallel to said driving shaft; a driving gear driven by saiddriving shaft; a first set of independently rotatable pairs of gears onsaid intermediate shaft, the gears of each pair of a number of saidpairs of gears being fixed non-rotatably relatively to one another; asecond set of independently rotatable pairs of gears, the gears of eachpair being fixed non-roshaft and adapted to be moved longitudinally ofsaid shifter-shaft by rotation of said shifter-shaft to selectivelyshift said shifter-gear into planar alignment with one gear of each pairof a number of pairs of said first set .of pairs of gears, andmeshing-means actuated by rotation of said shifter-shaft to cause saidframe to be swung toward said shifter-shaft to cause meshing of saidshifter-gear and a gear with which it has been selectively shifted intoplanar alignment; said gears being so constructed and arranged that saidselective engagement of said shifter-gear with said gears of said firstset of pairs of gears, selectively provides different selectablespeed-ratios between said driving and driven shafts.

8. A gear-changing drive including: a rotatable driving shaft; arotatable driven shaft; a frame pivoted to swing about an axis co-axialwith the axis of said driving shaft and normally yieldably urged toswing toward said driven shaft; an intermediate shaft mounted in saidframe parallel to said driving shaft; 2, driving gear driven by saiddriving shaft; a first set of independently rotatable pairs of gears onsaid intermediate shaft, the gears of each pair of a number of saidpairs of gears being fixed non-rotatably relatively to one another; asecond set of independently rotatable pairs of gears, the gears of eachpair being fixed non-rotatably relatively to one another: said drivinggear being in driving relation with one gear of a pair of said first setof pairs of gears; one gear of each pair of a number of pairs of saidfirst set of pairs of gears respectively being in driving relation witha gear of each pair of a number of pairs of said second set of pairs ofgears, and the other gear of each pair of a number of pairs of saidfirst set of pairs of gears respectively being in driven relation with agear of each pair of a number of pairs of said second set of pairs ofgears; a shifter-gear on and longitudinally slidable but non-rotatablerelatively to said driven shaft; a rotatably-mounted shifter-shaft;shifter-means engaged with said shifter-shaft and adapted to be movedlongitudinally of said shifter-shaft by rotation of said shifter-shaftto selectively shift said shifter-gear info planar alignment with onegear of each pair c number of pairs of said first set of pairs of andmeshing-means actuated by rotation o s id shifter-shaft to permit saidframe to be yieldably swung toward said driven shaft to cause a gear onsaid intermediate shaft which is in planar alignment with saidshifter-gear to mesh,

tatably relatively to one another; said driving gear being in drivingrelation with one gear of a pair of said first set of pairs of gears;one gear of each pair of a number of pairs of said first set of pairs ofgears respectively being in driving relation with a gear of each pair ofa number of pairs of said second set of pairs of gears, and the othergear of each pair of a number of pairs of said first set of pairs ofgears respectively being in driven relation with a gear of each of anumber of pairs of said second set of pairs of gears; a shifter-gear onand longitudinally slidable but non-rotatable relatively to said drivenshaft; a rotatably-mounted shifter-shaft; shifter-means engaged withsaid shifter-shaft and adapted to be moved longitudinally of saidshifter-shaft by rotation of said shifter-shaft to selectively shiftsaid shifter-gear into planar alignment with one gear of each pair of anumber of pairs of said first set of pairs of gears, and meshing-meansactuated by rotation of said shifter-shaft to cause said frame to beswung toward said shifter-shaft to cause meshing of said shifter-gearand a gear with which it has been selectively shifted into planaralignment; said gears being so constructed and arranged that saidselective engagement of said shifter-gear with said gears of said firstset of pairs of gears, selectively provides different selectablespeed-ratios between said driving and driven shafts; and speed-indicatormeans actuable by rotation of said shifter-shaft to indicate the speedcorresponding to any selectively meshed gears.

10. A gear-changing drive including: drivemeans; a rotatable driveshaft; an intermediate shaft; a plurality of rotatable gears on saidintermediate shaft; a shifter-gear on and longitudinally slidable butnon-rotatable relatively to said drive-shaft; and shifter-means adaptedto selectively shift said shifter-gear into planar alignment with anyone of a number of said rotatable gears; said intermediate shaft withsaid rotatable gear-s being constructed and arranged to be relativelymovable toward said shifter-gear to cause meshing of said shifter-gearand a gear with which it has been selectively shifted into planaralignment; and said drive-means being constructed and arranged to drivesaid rotatable gears at different speeds when any one of said rotatablegears is in mesh with said shiftergear.

11. A gear-changing drive including: drivemeans; a rotatable driveshaft; an intermediate shaft; a plurality of rotatable gears of the samepitch diameter on said intermediate shaft; a shifter-gear on andlongitudinally slidable but non-rotatable relatively to saiddrive-shaft;

shifter-means adapted to selectively shift said shifter-gear into planaralignment with any one of a number of said rotatable gears; saidintermediate shaft with said rotatable gears being constructed andarranged to be relatively movable toward said shifter-gear to causemeshing of said shifter-gear and a gear with which it has beenselectively shifted into planar alignment; said drive-means beingconstructed and arranged to drive said rotatable gears at differentspeeds when any one of said rotatable gears is in mesh with saidshifter-gear; and speed-indicator means actuated by said shifter-meansto indicate the speed corresponding to any selectively meshed gears.

12. A gear-changing drive including: a first rotatable shaft; a secondrotatable shaft; an intermediate shaft; a drive-gear in drive-relationwith said first rotatable shaft; a first set of independently rotatablepairs of gears on said intermediate shaft, the gears of each pair of anumber of said pairs being fixed non-rotatably relatively to oneanother; a second set of independently rotatable pairs of gears, thegears of each pair of a number of said pairs being fixed non-rotatablyrelatively to one another; said drive-gear being in drive-relation withone gear of a pair of said first set of pairs of gears; one gear of eachpair of a number of pairs of said first set of pairs of gearsrespectively being in driverelation with a gear of each pair of a numberof pairs of said second set of pairs of gears, and the other gear ofeach pair of a number of pairs of said first set of pairs of gearsrespectively being in drive-relation with a gear of each pair of anumber of pairs of said second set of pairs 01' gears; a shifter-gearhaving drive-relation with said second rotatable shaft, and adapted tobe selectively engaged in drive-relation with one gear of each pair of anumber of pairs of said first set of pairs of gears; said gears being soconstructed and arranged that said selective engagement of saidshifter-gear with said gears of said first set of pairs of gears,selectively provides different selectable speed-ratios between saidfirst and second rotatable shafts.

JOHN ELLISON GORRELL.

REFERENCES CITED The following references are of record in the filo ofthis patent:

UNITED STATES PATENTS Number Name Date 1,508,879 Healey Sept. 16, 19241,967,559 Schreck July 24, 1934 1,984,039 Sieg Dec. 11, 1934

